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(-_) �_ <br /> Potential Potential <br /> o <br /> Significance Significance <br /> Without Mitigation With N a <br /> Impacts Mitigation Mitigation Measures Responsibility Mitigation N, o <br /> 0 0 <br /> and underground utility systems, a possibility that foundation and utility construction. Wherever n <br /> represents a potentially significant impact. corrosive soils are found in sufficient concentrations, <br /> recommendations shall be made to protect iron, <br /> steel, metal, and concrete from long-term <br /> deterioration caused by contact with corrosive on- <br /> site soils. In general, these recommendations are <br /> expected to include, but not be limited to, the <br /> following provisions: <br /> • Protect buried iron, steel, cast iron, ductile iron, <br /> galvanized steel, and dielectric coated steel or <br /> iron (including all buried metallic pressure <br /> piping)against corrosion from soil. <br /> • Protect buried metal and cement structures in <br /> contact with earth surfaces from chloride ion <br /> concentrations. <br /> • Use sulfate-resistant concrete mix for all <br /> concrete in contact with the ground, including <br /> piles, pile caps, and grade beams. <br /> • Consult a corrosion expert during the project's <br /> detailed design phase to help design the most <br /> effective corrosion protection. <br /> Implementation of this measure would reduce this <br /> potential to a less-than-significant level. <br /> Impact 11-6: Soil Erosion and Sedimentation. S Mitigation 11-6: Require that the applicant prepare Applicant LS <br /> Project development would disturb the site's natural an erosion control plan subject to City approval and <br /> topography and vegetative cover, leaving soils consistent with the required project Stormwater <br /> exposed to wind and water erosion during the Pollution Prevention Plan (SWPPP)(see Mitigation <br /> construction period. Eroded soils would be washed 9-1). Implement the plan during construction. m <br /> either directly into Redwood Creek, Smith Slough, or Erosion during all phases of construction shall be <br /> the marina, or into on-site drainage facilities,which controlled through the use of erosion and soil co D <br /> D <br /> S = Significant _ <br /> LS = Less than significant j -0; <br /> SU = Significant unavoidable impact c <br /> NA = Not applicable <br /> T:110695 Pete's Harbor EIR Addendumlrevised addendum no 21Table 1-1(10695-01).doc 01 <br />